Use of Pugsley's Sterile Wheat in Cross Breeding 1

1 Cooperative investigations of the Crop Research Division, ARS, USDA, and the Agronomy Department, University of California, Davis. Received Feb. 5, 1962. 2 Research Agronomist, U. S. Department of Agriculture and Associate in Agronomy, Davis, California. Kenya Farmer X Javelin 48*. Out pollination was more frequent in the field than in the glasshouse. From a study of selfed plants in segregating rows it was suggested that the male sterility was "due to homozvgosity either for a recessive allele at one locus, which is less viable than the dominant allele, or for complimentary recessive alleles at two loci". They concluded that "the dYta available to date are not in complete accord with either hypothesis". The initial American seed stock was a hybrid segregating for awn type which produced two "male sterile" plants. These plants were not male sterile in the simple perspective of monogenic male-sterile barley, though their appear-